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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Revenues $ 581,443 $ 455,686
Expenses 342,620 301,333
Operating profit (loss) 238,823 154,353
Private Banks    
Segment Reporting Information [Line Items]    
Revenues 213,548 117,608
Expenses 121,955 110,724
Operating profit (loss) 91,593 6,884
Investment Advisors    
Segment Reporting Information [Line Items]    
Revenues 119,230 113,294
Expenses 64,520 55,027
Operating profit (loss) 54,710 58,267
Institutional Investors    
Segment Reporting Information [Line Items]    
Revenues 86,839 84,499
Expenses 45,358 39,158
Operating profit (loss) 41,481 45,341
Investment Managers    
Segment Reporting Information [Line Items]    
Revenues 156,901 136,419
Expenses 98,837 83,020
Operating profit (loss) 58,064 53,399
Investments In New Businesses    
Segment Reporting Information [Line Items]    
Revenues 4,925 3,866
Expenses 11,950 13,404
Operating profit (loss) $ (7,025) $ (9,538)